EP0723261B1 - Optisches Aufzeichnungsmedium und Verfahren zu seiner Herstellung - Google Patents

Optisches Aufzeichnungsmedium und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0723261B1
EP0723261B1 EP96300408A EP96300408A EP0723261B1 EP 0723261 B1 EP0723261 B1 EP 0723261B1 EP 96300408 A EP96300408 A EP 96300408A EP 96300408 A EP96300408 A EP 96300408A EP 0723261 B1 EP0723261 B1 EP 0723261B1
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EP
European Patent Office
Prior art keywords
protective layer
substrate
opening
recording medium
resin composition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96300408A
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English (en)
French (fr)
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EP0723261A3 (de
EP0723261A2 (de
Inventor
Ryuichi Yokoyama
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Canon Inc
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Canon Inc
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Publication of EP0723261A2 publication Critical patent/EP0723261A2/de
Publication of EP0723261A3 publication Critical patent/EP0723261A3/de
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Publication of EP0723261B1 publication Critical patent/EP0723261B1/de
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B7/2572—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of organic materials
    • G11B7/2575—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of organic materials resins
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
    • G11B7/2542—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of organic resins
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
    • G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
    • G11B7/2534—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins polycarbonates [PC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/913—Material designed to be responsive to temperature, light, moisture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/146—Laser beam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/21—Circular sheet or circular blank

Definitions

  • the present invention relates to an optical recording medium, and a process for producing such a medium, upon which at least one of recording, reproducing and erasing of information is optically performed.
  • JP-A-3207036 and JP-A-5706542 disclose the application of a resin for protection of a recording layer.
  • JP-A-3207036 and JP-A-5706542 disclose the application of a resin for protection of a recording layer.
  • the addition of an antistatic agent and a lubricant to the protective layer causes corrosion and blister formation in the recording layer.
  • JP-A-6176401 on which the two part form of claims 1 and 11 is based, discloses an optical information recording medium comprising two protective layers.
  • a possible method of forming, with good productivity, a multi-layer protective layer comprising laminated photo-cured resin layers on a disk substrate is a method comprising coating a photo-curable resin composition for forming a first protective layer by a spin coating method, curing the resin composition to form the first protective layer, coating a photo-curable resin composition for forming a second protective layer by the spin coating method and then curing the resin composition to form the second protective layer.
  • Spin coating of an optical recording medium is disclosed in JP-A-59206077.
  • the magnetic head When a magnetooptical recording medium, and particularly a magnetooptical recording medium for recording data thereon in a magnetic field modulation system, is produced by the above-described process, the magnetic head may be broken due to collision between the magnetic head and the protective layer having a nonuniform thickness, or recorded data is lost due to breakage of the magnetooptical recording medium.
  • the present invention has been achieved in consideration of the above problems.
  • an optical recording medium comprising:
  • An advantage of the present invention is that it provides an optical recording medium having an excellent appearance even when a multi-layer protective layer is formed by a spin coating method.
  • Another advantage of the present invention is that it provides an optical recording medium which minimizes or eliminates recording errors.
  • Another advantage of the present invention is producing, with good productivity, an optical recording medium comprising a multi-layer protective layer, which minimizes or eliminates inferior products.
  • reference numeral 1 denotes a magnetooptical disk
  • reference numeral 2 denotes a substrate having a centre hole 3
  • reference numeral 4 denotes a magnetooptical recording layer
  • reference P denotes a multi-layer protective layer comprising a first protective layer 5 and a second protective layer 6.
  • the first and second protective layers are formed in an annular form on the substrate 2 so that the diameter of an opening of the second protective layer 6 is greater than the diameter of an opening of the first protective layer 5.
  • a photo-curable resin composition 8 is provided in an annular form on the substrate 2 having the recording layer 4 formed thereon, in the vicinity of the center hole 3, and the photo-curable resin composition 8 is then spread by rotating the substrate 2 to coat the recording layer 4 with the resin composition 8. Thereafter, the photo-curable resin composition is cured by irradiation with light to form the first protective layer 5. It is preferable that the diameter of an opening 7 of the first protective layer 5 is larger than the diameter of the center hole 3 of the substrate 2.
  • the photo-curable resin composition for forming the first protective layer 5 is applied or deposited as an annular ring in the vicinity of the center hole 3 of the substrate 2, and then spin-coated so as not to drop into the center hole 3 of the substrate 2 on side wall 31.
  • the rotational speed is generally increased during the final stage of the coating step, before the coating step is completed.
  • resin material located on the side wall 31 of the center hole 3 may be returned to the surface of the first protective layer and radially spread out on the surface thereof by centrifugal force, when the rotational speed is increased at the end of the spin-coating process to make the surface of the resin composition for first protective layer flat and smooth.
  • resin marks may remain on the surface of the first protective layer 5 and thus deteriorate not only the appearance of the surface of the first protective layer 5 but also the smoothness of the first protective layer 5, thereby causing head crash.
  • the photo-curable resin composition for forming the first protective layer 5 In order to prevent the photo-curable resin composition for forming the first protective layer 5 from dropping into the center hole 3 on the side wall 31 of the substrate 2 during the step of applying the resin composition in the vicinity of the center hole 3 of the substrate 2 and the subsequent spin coating step, it is effective to control the angle of contact between the resin composition and the substrate, the position of deposition of the resin composition, etc. For example, it is preferable to appropriately set the above coating conditions so as to prevent the resin composition from sufficiently spreading during the time the resin composition is supplied to a portion in the vicinity of the centre hole of the substrate.
  • the second protective layer 6 on the first protective layer 5 is formed by depositing an annular ring of a photo-curable resin composition 9 for forming the second protective layer 6, spreading the resin composition 9 by rotating the substrate 2 and then curing the resin composition by irradiation with light.
  • the diameter of an opening of the second protective layer 6 is greater than that of the opening of the first protective layer 5. Namely, in order to prevent the photo-curable resin composition for forming the second protective layer from dropping into the opening on side wall 31 of the centre hole 3 of the substrate 2 during the step of depositing the resin composition in the vicinity of the centre hole 3 of the substrate 2 and the subsequent spin coating step, it is effective to control the angle of contact between the resin composition for forming the second protective layer and the substrate, the position of deposition of the resin composition, etc. For example, it is preferable to appropriately set the above coating conditions so as to prevent the resin composition from sufficiently spreading during the time the resin composition is supplied to a portion in the vicinity of the center hole of the substrate.
  • an optical recording medium having a multi-layer protective layer comprising two protective layers
  • the technology of the present invention is also useful for an optical recording medium having a multi-layer protective layer comprising three or more protective layers.
  • an optical recording medium having a multi-layer protective layer can be produced by using the spin coating method in which the diameter of an opening of a (n+1)th protective layer (n is an integer of 1 or more) in the multi-layer protective layer from the side of the recording layer is greater than the diameter of an opening of a (n)th protective layer.
  • the photo-curable resin compositions for the multi-layer protective layer are not limited as long as they have no adverse effect on the recording layer and satisfy the above-described characteristics.
  • acrylic ultraviolet curing resins and the like can be used.
  • component (A) examples include polyol polyacrylates (polyhydric alcohol or polyether polyacrylates), particularly, at least trifunctional polyol polyacrylates, such as pentaerythritol triacrylate, dipentaerythritol hexaacrylate, and the like; modified polyol polyacrylates (polyacrylates of polyols modified by epoxide or lactone or diacrylates of modified diols obtained by adding epoxide to polyhydroxy phenols such as bisphenol A or bisphenol S); polyester acrylates (produced by condensation telomerization of polyhydroxy alcohols, polybasic acids or anhydrides thereof and acrylic acid); urethane acrylates (produced by reaction of polyols such as polyether polyols or polyester polyols, polyisocyanate and acrylates having a hydroxyl group); epoxy acrylates (oligomers obtained by adding acrylic acid or acrylates having a terminal carboxyl group to epoxy compounds); bisphenol A diglycidyl ethers
  • component (B) examples include acrylates of polyhydroxy alcohols, particularly, polyfunctional acrylic monomers, for example acrylates such as ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, butylene glycol diacrylate, neopentyl glycol diacrylate, 1,4-butanediol diacrylate, 1,4-hexanediol diacrylate, pentaerythritol diacrylate and the like; triacrylates such as pentaerythritol triacrylate, trimethylolpropane triacrylate and the like. Any one of these compounds or a mixture comprising at least two of these compounds can be used as component (B).
  • acrylates such as ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, butylene glycol diacrylate, neopentyl glycol diacrylate, 1,4-butaned
  • initiators exhibiting good storage stability after mixing are preferable.
  • examples of such initiators include benzoin alkyl ether types such as benzoin ethyl ether, benzoin isobutyl ether and the like; acetophenone types such as 2,2'-diethoxyacetophenone, 4'-phenoxy-2,2-dichloroacetophenone, and the like; propiophenone types such as 2-hydroxy-2-methylpropiophenone, 4'-isopropyl-2-hydroxy-2-methylpropiophenone and the like; anthraquinone types such as benzyl methyl ketal, 1-hydroxycyclohexyl phenyl ketone, 2-ethyl anthraquinone and 2-chloroanthraquinone and the like; thioxanthone types such as 2,4-dimethyl thioxanthone, Michler's ketone and the like.
  • a recording layer which is generally used for optical recording such as a recording layer containing an organic dye, e.g., a polymethine dye or cyanine dye, a magnetooptical recording layer containing a rare earth metal or transition metal, can be used as the recording layer.
  • an organic dye e.g., a polymethine dye or cyanine dye
  • a magnetooptical recording layer containing a rare earth metal or transition metal can be used as the recording layer.
  • the substrate is preferably transparent to the light beam.
  • substrates comprising bisphenol A type polycarbonate, acrylic resin, methacrylic resin, polystyrene resin, polyolefin resin and the like.
  • the (n+1)th protective layer is formed so as to have an opening larger than the opening of the (n)th protective layer, thereby preventing the occurrence of nonuniformity of the thickness due to stripe marks.
  • the angle of contact between the curable resin for the second protective layer and the first protective layer is larger than the angle of contact between the curable resin for the first protective layer and the substrate, thereby facilitating control of the coating positions of the curable resins and the thicknesses of the layers, and thus improving productivity.
  • the angle of contact between the curable resin for the (n+2)th protective layer and the (n+1)th protective layer is larger than the angle of contact between the curable resin for the (n+1)th protective layer and the (n)th protective layer, thereby facilitating control of the resin coating positions and the thicknesses of the layers, and thus improving productivity.
  • an annular magnetooptical recording layer 4 was formed, by a sputtering method, so as to be concentric with the disk substrate 2.
  • the recording layer 4 comprised an inorganic protective layer, a magnetic layer, an inorganic protective layer and a reflecting layer, the radii (dl) and (d2) of small and large circles of the annular recording layer 4 being 20 mm and 42.5 mm, respectively.
  • An epoxyacrylate ultraviolet curable resin (Trade Name: MH-7210; produced by Mitsubishi Rayon Co., Ltd.) having a surface tension of about 29mN/m at 23°C was circumferentially supplied in an annular form whose centre coincided with the centre hole 3 of the substrate 2 and which had a radius of 16.5mm, as shown in Fig. 2.
  • the curing resin was then coated in a thickness of about 6 ⁇ m by a spin coating method on a doughnut-like annular region concentric with the centre hole 3 and surrounded by circles having a radii of 16mm and 43mm to cover the recording layer 4.
  • the curing resin was then irradiated with ultraviolet light to form a first protective layer 5.
  • An ultraviolet curing apoxyacrylate resin (Trade Name: EX-841; produced by Dainippon Ink Co., Ltd) having a surface tension of about 37mN/m at 23°C was supplied in an annular form whose centre coincided with the centre hole 3 of the substrate 2 and which had a radius of 16.5mm, on the first protective layer, and was then spin-coated to form a second protective layer 6 of about 4 ⁇ m thickness. In this way, a magnetooptical disk with a multi-layer protective layer P was formed.
  • EX-841 produced by Dainippon Ink Co., Ltd
  • the radius r 1 of the opening of the first protective layer 5 formed by curing was about 16mm
  • the radius r 2 of the opening of the second protective layer 6 was 16.2 mm
  • the angle of contact between the material for the first protective layer 5 and the substrate 2 was about 30°
  • the angle of contact between the material for the second protective layer 6 and the first protective layer 5 was about 60°.
  • materials having different surface tensions were used in order to cause the different contact angles. Namely, a material having a surface tension lower than that of the material for the second protective layer 6 was used for the first protective layer 5 so that the angle of contact between the material for the first protective layer 5 and the substrate 2 was smaller than the angle of contact between the material for the second protective layer 6 and the first protective layer 5. This increased the contact angle of the material for the upper second protective layer 6 and thus facilitated control of the coating positions and of the thicknesses of the layers, thereby improving productivity.
  • a magnetooptical disk was produced in the same manner as in Example 1 except that an ultraviolet curable epoxyacrylate resin (Trade Name: EX-841; produced by Dainippon Ink Co., Ltd.) having a surface tension of about 37 mN/m was used as a material for the first protective layer 5 under heating at about 40°C, and the same ultraviolet curable epoxyacrylate resin as the resin used for the first protective layer 5 was used as the material for the second protective layer 6 under cooling at about 15°C.
  • an ultraviolet curable epoxyacrylate resin (Trade Name: EX-841; produced by Dainippon Ink Co., Ltd.) having a surface tension of about 37 mN/m was used as a material for the first protective layer 5 under heating at about 40°C
  • the same ultraviolet curable epoxyacrylate resin as the resin used for the first protective layer 5 was used as the material for the second protective layer 6 under cooling at about 15°C.
  • the radius r 1 of the opening of the first protective layer 5 formed by curing was about 16 mm
  • the radius r 2 of the opening of the second protective layer 6 was 16.3 mm
  • the angle of contact between the material for the first protective layer 5 and the substrate 2 was about 30°
  • the angle of contact between the material for the second protective layer 6 and the first protective layer 5 was about 63°.
  • the respective resin materials were coated at different temperatures in order to cause different contact angles.
  • the coating temperature of the material for the first protective layer 5 was relatively high, and the coating temperature of the material for the second protective layer 6 was relatively low so that the angle of contact between the material for the first protective layer 5 and the substrate 2 was smaller than the angle of contact between the material for the second protective layer 6 and the first protective layer 5.
  • the contact angle of the material used can be changed by temperature control, various materials can be used without being restricted by surface tension and viscosity.
  • a magnetooptical disk was produced in the same manner as that in Example 1, except that the material for the second protective layer 6 was circumferentially supplied in an annular form which was concentric with the center hole 3 of the substrate 2 and which had a radius of 17.5 mm. As a result, the radius (r 2 ) of the opening of the second protective layer 6 was 17.2 mm.
  • a magnetooptical disk was produced in the same manner as that in Example 2, except that the material for the second protective layer 6 was circumferentially supplied in an annular form which was concentric with the center hole 3 of the substrate 2 and which had a radius of 17.5 mm. As a result, the radius (r 2 ) of the opening of the second protective layer 6 was 17.3 mm.
  • a recording layer 4 was formed on a polycarbonate substrate 2 in the same manner as that in Example 1.
  • An ultraviolet curable urethane acrylate resin (Trade Name:SD-301; produced by Dainippon Ink Co., Ltd.) having a surface tension of about 40 mN/m at 23°C was circumferentially supplied in an annular form which was concentric with the center hole 3 of the substrate 2 and which had a radius of 16.5 mm.
  • the curing resin was then coated, by a spin coating method, on a doughnut-like annular region surrounded by a circle which was concentric with the center hole 3 and which had a radius of 43 mm and a circle which was concentric with the center hole 3 and which had a radius of 16 mm, to form a resin layer having a thickness of 6 ⁇ m for coating the recording layer 4.
  • the resin layer was then cured by irradiation with ultraviolet light to form the first protective layer 5.
  • An ultraviolet curable epoxyacrylate resin (Trade Name: MH-7210; produced by Mitsubishi Rayon Co., Ltd.) having a surface tension of about 26 mN/m at 23°C and containing an antistatic agent was circumferentially supplied in an annular form which was concentric with the center hole 3 and which had a radius of 19.5 mm, on the first protective layer 5.
  • the resin was coated to a thickness of about 4 ⁇ m on the first protective layer 5 by a spin coating method, and then irradiated with ultraviolet light to form the second protective layer 6. In this way, a magnetooptical disk was obtained.
  • the radius r 1 of the opening of the first protective layer 5 was about 16 mm
  • the radius r 2 of the opening of the second protective layer 6 was about 17.5 mm
  • the angle of contact between the material for the first protective layer 5 and the substrate 2 was about 60°
  • the angle of contact between the material for the second protective layer 6 and the first protective layer 5 was about 30°.
  • the magnetooptical disk obtained in this example caused no streak having a nonuniform thickness or visually recognizable on the surface of the second protective layer 6, thereby increasing the yield of the magnetooptical disk.
  • a magnetooptical disk was produced in the same manner as that in Example 5, except that the photo-curable resin composition for the second protective layer 6 was circumferentially supplied in an annular form which was concentric with the center hole 3 and which had a radius of 16.5 mm, on the first protective layer 5.
  • the magnetooptical disk of this example was thus unsuitable as a magnetooptical disk, particularly as a magnetooptical disk in a magnetic field modulation recording system.

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Claims (20)

  1. Optisches Aufzeichnungsmaterial, umfassend:
    einen Träger (2) mit einer Öffnung (3);
    eine auf einem Träger gebildete Aufzeichnungsschicht (4); und
    eine Mehrfachschichtschutzschicht (P), welche eine Mehrzahl von nacheinander auf mindestens einem Abschnitt des Trägers (2) sowie der Aufzeichnungsschicht (4) gebildeten Schutzschichten (5, 6) umfasst, wobei jede der Mehrzahl der Schutzschichten (5, 6) eine jeweilige Öffnung aufweist und jede der jeweiligen Öffnungen der Mehrzahl der Schutzschichten größer ist als die Öffnung im Träger, wobei die Öffnung im Träger innerhalb des Umfangs der Öffnung in jeder der Mehrzahl der Schutzschichten lokalisiert ist, wobei das Material dadurch gekennzeichnet ist, daß die Öffnung in jeder aufeinanderfolgenden Schutzschicht in der Richtung, die vom Träger wegführt, sukzessive größer ist als die Öffnung in der angrenzenden Schutzschicht, welche sich näher zum Träger hin befindet, und daß der Umfang der Öffnung in jeder Schutzschicht innerhalb des Umfangs der Öffnung der angrenzenden Schutzschicht in der Richtung, die vom Träger wegführt, lokalisiert ist.
  2. Optisches Aufzeichnungsmaterial nach Anspruch 1, wobei der Träger (2) scheibenförmig ist.
  3. Optisches Aufzeichnungsmaterial nach Anspruch 1 oder 2, wobei die Mitte des Loches jeder der Schutzschichten (P) mit der Mitte des Loches in dem Träger (2) übereinstimmt.
  4. Optisches Aufzeichnungsmaterial nach Anspruch 1, 2 oder 3, wobei die Öffnung (3) im Träger (2) und die Öffnung in jeder der Schutzschichten (P) kreisförmig sind.
  5. Optisches Aufzeichnungsmaterial nach einem der Ansprüche 1 bis 4, wobei die Schutzschicht (P) eine photogehärtete Harzzusammensetzung umfasst.
  6. Optisches Aufzeichnungsmaterial nach einem der Ansprüche 1 bis 4, wobei jede der Mehrzahl der Schutzschichten (5, 6) in der Mehrfachschichtschutzschicht (P) eine photogehärtete Harzzusammensetzung umfasst.
  7. Optisches Aufzeichnungsmaterial nach einem der Ansprüche 1 bis 4, wobei die Mehrfachschichtschutzschicht (P) eine erste Schutzschicht (5), die auf mindestens einem Abschnitt des Trägers (2) gebildet ist, und eine zweite Schutzschicht (6) umfasst, die auf der ersten Schutzschicht (5) gebildet ist, wobei die erste Schutzschicht (5) eine photogehärtete Harzzusammensetzung umfasst, die vor dem Härten eine erste Oberflächenspannung aufweist, die beim Aufbringen auf den Träger zu einem ersten Kontaktwinkel mit dem Träger (2) führt, und wobei die zweite Schutzschicht (6) eine photogehärtete Harzzusammensetzung umfasst, die vor dem Härten eine zweite Oberflächenspannung aufweist, die zu einem zweiten Kontaktwinkel mit der ersten Schutzschicht (5) führt, wobei die erste Oberflächenspannung geringer als die zweite Oberflächenspannung ist, so daß der erste Kontaktwinkel kleiner ist als der zweite Kontaktwinkel.
  8. Optische Aufzeichnungsmaterial nach einem der Ansprüche 1 bis 4, wobei eine Schutzschicht in der Mehrfachschichtschutzschicht (P) eine photogehärtete Harzzusammensetzung umfasst, die vor dem Härten eine erste Oberflächenspannung aufweist, die zu einem ersten Kontaktwinkel mit der angrenzenden Schutzschicht führt, die näher am Träger ist, wenn sie auf diese nähere Schicht aufgebracht wird, und wobei die angrenzende Schutzschicht, die weiter als die eine Schutzschicht vom Träger entfernt ist, eine photogehärtete Harzzusammensetzung umfasst, die vor dem Härten eine zweite Oberflächenspannung aufweist, die zu einem zweiten Kontaktwinkel mit der einen Schutzschicht führt, wobei die erste Oberflächenspannung niedriger ist als die zweite Oberflächenspannung, so daß der erste Kontaktwinkel kleiner als der zweite Kontaktwinkel ist.
  9. Optisches Aufzeichnungsmaterial nach einem der vorangehenden Ansprüche, wobei die Mehrfachschichtschutzschicht (P) eine erste, auf der Aufzeichnungsschicht vorliegende Schutzschicht und eine zweite, auf der ersten Schutzschicht bereitgestellte Schutzschicht umfasst, und wobei die zweite Schutzschicht ein antistatisches Mittel oder Schmiermittel enthält.
  10. Optisches Aufzeichnungsmaterial nach einem der vorangehenden Ansprüche, wobei der Träger optisch transparent ist.
  11. Verfahren zur Herstellung eines optischen Aufzeichnungsmaterials, welches die Schritte umfasst der:
    Bereitstellung eines Trägers (2) mit einer Öffnung;
    Bildung einer Aufzeichnungsschicht (4) auf dem Träger (2); und
    Bildung einer Mehrfachschichtschutzschicht (P), welche eine Mehrzahl von aufeinanderfolgend gebildeten Schutzschichten (5, 6) auf mindestens einem Abschnitt des Trägers (2) sowie der Aufzeichnungsschicht (4) umfasst, wobei jede der Mehrzahl der Schutzschichten (5, 6) eine jeweilige Öffnung aufweist und jede der jeweiligen Öffnungen größer ist als die Öffnung im Träger, wobei die Öffnung im Träger innerhalb des Umfangs der Öffnung in jeder der Mehrzahl der Schichten lokalisiert ist, dadurch gekennzeichnet, daß die Öffnung in jeder aufeinanderfolgenden Schutzschicht in der Richtung, die vom Träger wegführt, sukzessive größer ist als die Öffnung in der angrenzenden Schutzschicht, welche sich näher zum Träger hin befindet, und daß der Umfang der Öffnung in jeder Schutzschicht innerhalb des Umfangs der Öffnung der angrenzenden Schutzschicht in der Richtung, die vom Träger wegführt, lokalisiert ist.
  12. Verfahren zur Herstellung eines optischen Aufzeichnungsmaterials nach Anspruch 11, wobei die Mitte des Loches jeder Schutzschicht sich deckend mit der Mitte der Öffnung des Trägers gebildet wird.
  13. Verfahren zur Herstellung eines optischen Aufzeichnungsmaterials nach Anspruch 11 oder 12, wobei die Öffnung im Träger und die Öffnung in den Schutzschichten kreisförmig sind.
  14. Verfahren zur Herstellung eines optischen Aufzeichnungsmaterials nach Anspruch 11, 12 oder 13, wobei jede der aufeinanderfolgend gebildeten Schutzschichten der Mehrfachschichtschutzschicht ein photogehärtetes Harz umfasst.
  15. Verfahren zur Herstellung eines optischen Aufzeichnungsmaterials nach Anspruch 11, wobei die Schritte der Bildung einer Mehrzahl aufeinanderfolgend gebildeter Schutzschichten die Bildung einer ersten, eine photogehärtete Harzzusammensetzung umfassenden Schutzschicht, wobei die Harzzusammensetzung vor der Härtung eine erste Oberflächenspannung aufweist, die zu einem ersten Kontaktwinkel mit dem Träger führt, wenn sie auf dem Träger aufgebracht ist sowie die Bildung einer zweiten, eine photogehärtete Harzzusammensetzung umfassenden Schutzschicht, wobei die Harzzusamensetzung vor der Härtung eine zweite Oberflächenspannung aufweist, die zu einem zweiten Kontaktwinkel mit der ersten Schutzschicht führt, wenn sie auf der ersten Schutzschicht aufgebracht ist, wobei die erste Oberflächenspannung geringer ist als die zweite Oberflächenspannung, so daß der erste Kontaktwinkel kleiner ist als der zweite Kontaktwinkel, einschließt.
  16. Verfahren zur Herstellung eines optischen Aufzeichnungsmaterials nach Anspruch 11, wobei der Schritt der Bildung einer Mehrzahl aufeinanderfolgend gebildeter Schutzschichten die Bildung einer eine photogehärtete Harzzusammensetzung umfassenden Schutzschicht, wobei die Harzzusammensetzung vor der Härtung eine erste Oberflächenspannung aufweist, die zu einem ersten Kontaktwinkel mit der angrenzenden Schutzschicht, die näher am Träger ist, führt, sowie die Bildung einer angrenzenden Schutzschicht, welche weiter vom Träger entfernt ist als die eine, eine photogehärtete Zusammensetzung umfassende Schutzschicht, wobei die Harzzusammensetzung vor der Härtung eine zweite Oberflächenspannung aufweist, die zu einem zweiten Kontaktwinkel mit der einen Schutzschicht führt und die erste Oberflächenspannung kleiner ist als die zweite Oberflächenspannung, so daß der erste Kontaktwinkel kleiner ist als der zweite Kontaktwinkel, einschließt.
  17. Verfahren zur Herstellung eines optischen Aufzeichnungsmaterials nach Anspruch 11, wobei der Schritt zur Bildung einer Mehrfachschichtschutzschicht die Schritte umfasst der:
    aufeinanderfolgenden Bildung einer Mehrzahl von Schutzschichten auf mindestens einem Abschnitt des Trägers und der Aufzeichnungsschicht, wobei jede der Mehrzahl der Schutzschichten gebildet ist durch:
    Aufbringen eines ringförmigen Ringes aus photohärtbarer Harzzusammensetzung auf dem Träger um die Öffnung im Träger herum oder auf die angrenzende Schutzschicht, die näher am Träger ist, um eine Öffnung in der angrenzenden Schutzschicht herum,
    Aufschleuderbeschichtung des rinförmigen Ringes aus photohärtbarem Harzmaterial über mindestens einen Abschnitt des Trägers und der Aufzeichnungsschicht oder über einen Abschnitt der jeweiligen angrenzenden Schutzschicht, die näher am Träger ist, und
    Photohärtung des photohärtbaren Harzmaterials,
    wobei mindestens eine Charakteristik des photohärtbaren Harzmaterials für die jeweilige Schutzschicht gesteuert wird und die Position des jeweiligen ringförmigen Ringes aus photohärtbarem Harzmaterial so gesteuert wird, daß jede der Öffnungen in der Schutzschicht größer ist als die Öffnung im Träger und die Öffnung der jeweiligen angrenzenden Schutzschicht, die näher am Träger ist.
  18. Verfahren zur Herstellung eines optischen Aufzeichnungsmaterials nach Anspruch 17, wobei die Charakteristik des jeweiligen photohärtbaren Harzmaterials so gesteuert wird, daß die Harzzusammensetzung einer Schutzschicht vor der Härtung eine erste Oberflächenspannung aufweist, die zu einem ersten Kontaktwinkel mit der angrenzenden Schutzschicht, die näher am Träger als die eine Schutzschicht ist, führt, wenn sie auf diese nähere Schicht aufgebracht ist, sowie die Harzzusammensetzung der angrenzenden Schutzschicht, die weiter vom Träger entfernt ist als die eine Schutzschicht, vor der Härtung eine zweite Oberflächenspannung aufweist, die zu einem zweiten Kontaktwinkel mit der einen Schutzschicht führt, wenn sie auf die eine Schutzschicht aufgebracht ist, wobei die erste Oberflächenspannung niedriger ist als die zweite Oberflächenspannung, so daß der erste Kontaktwinkel kleiner ist als der zweite Kontaktwinkel.
  19. Verfahren zur Herstellung eines optischen Aufzeichnungsmaterials nach Anspruch 18, wobei der Bildungsschritt die Steuerung einer Beschichtungstemperatur des jeweiligen photohärtbaren Harzmaterials einschließt.
  20. Verfahren zur Herstellung eines optischen Aufzeichnungsmaterials nach einem der Ansprüche 11 bis 19, wobei der Träger aus einem optisch transparenten Material gebildet ist.
EP96300408A 1995-01-23 1996-01-22 Optisches Aufzeichnungsmedium und Verfahren zu seiner Herstellung Expired - Lifetime EP0723261B1 (de)

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EP0723261A2 (de) 1996-07-24

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